Modelling the spatial and genetic response of the endemic sparid: Polysteganus praeorbitalis (Pisces: Sparidae) to climate change in the Agulhas Current system
- Authors: Isemonger, Devin Neil
- Date: 2014
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/54509 , vital:26576
- Description: The Scotsman Seabream, Polysteganus praeorbitalis, is one of several large, slow-growing members of the Sparidae family of fishes endemic to the Agulhas Current system in the Western Indian Ocean (WIO). Relatively little research has been conducted on this species despite its importance to both recreational and commercial line fisheries in South Africa and the drastic decline in catch per unit effort (CPUE) that has been recorded since the 1940s. Changing sea temperatures as a result of global climate change are further expected to affect the distribution and abundance of many fish species based on their thermal tolerances, life histories and population structures. The ability of these species to shift their distribution and adapt to new environments and thermal conditions will depend to some degree on the levels of genetic variation and gene flow, within and between populations. A combined approach using species distribution modelling and genetic analyses may prove to be a useful tool in investigating the potential effects of climate change on the distribution and genetic diversity of species. An ensemble species distribution model (SDM) based on 205 occurrence records and 30 years of Reynolds Optimum Interpolated (OI) sea surface temperature data was constructed to predict the distributional response of P. praeorbitalis to climate change in the Agulhas Current system. The ensemble SDM displayed a true skill statistic (TSS) of 0.975 and an area under the receiver operating curve (ROC) of 0.999, indicating good model fit. Autumn and winter minimum temperatures, as well as bathymetry, were the most important predictor variables in the majority of models, indicating that these variables may directly constrain the distribution of P. praeorbitalis. In particular, the southern range edge of this species appeared to be constrained by autumn and winter minima, with high model agreement on this range edge. Conversely, the northern range limit showed poor model agreement leading to a gradual reduction in occurrence. This indicates that this range edge may be constrained by other factors not included in the models such as species interactions. The ensemble SDM projected the current range of P. praeorbitalis to be 1500 km², smaller than the published range for this species. The model underestimated the northern range edge of this species by approximately 5° latitude when binary transformed. This is probably due to the rarity of this species in the landings of the Mozambican linefishery, which was assumed to be an indication of low abundance of P. praeorbitalis in these waters. The absence of a specimen to verify the published northern range edge of this species indicates that the northern range edge produced by this model is likely to be closer to the actual range limit of the species. A range contraction of 30% occurring at both the northern and southern edge of P. praeorbitalis’ range and range fragmentation occurring, towards its northern range edge by 2030, was predicted. These changes are modelled to be the results of cooling related to the intensification of the Port Alfred upwelling cell and of warming predicted north of the Natal Bight and in southern Mozambique. Genetic analyses of the nuclear DNA (nDNA) S7 intron 1 and mitochondrial DNA (mtDNA) control region genes were carried out using 118 tissue samples of P. praeorbitalis collected at four main localities: the Eastern Cape, Transkei, southern KwaZulu-Natal and northern KwaZulu-Natal. Analyses of genetic diversity levels revealed relatively low diversity in the mtDNA dataset (Hd = 0.488; π = 0.004) and moderate levels of diversity in the nDNA dataset (Ad = 0.922; π = 0.005). The low levels of diversity observed in the mtDNA dataset might be explained by a number of factors, including high variation in spawning success, the negative effects of over-harvesting, or a recent population bottleneck. The last explanation is supported by characteristic star-shaped haplotype networks and unimodal mismatch distributions displayed by both datasets. These results, in conjunction with a significant (p = 0.005) negative Tajimas D value (-2.029) in the mtDNA dataset and significant (p = 0.0005) negative Fu’s F statistic in both the nDNA (F = -26.5) and mtDNA (F = -11.9) datasets, provide strong evidence for a recent population expansion after a bottleneck event in this species. Spatially, mtDNA diversity was highest in the Eastern Cape and lowest in the middle localities, while nDNA diversity showed the opposite pattern. These results may be indicative of differences in the sex ratio between localities, possibly as a result of the protogynous hermaphroditism that has been postulated for this species. Although pairwise comparisons and exact tests of population differentiation revealed no significant geneticdifferentiation between populations in the mtDNA dataset, there was some evidence of low levels of differentiation in the nDNA dataset. This occurred for comparisons between the Eastern Cape and Transkei (Fst = 0.039; p <0.05), and the northern KwaZulu-Natal (Fst = 0.045; p < 0.05).. This might be the result of one or a combination of factors including the effects of the Port Alfred upwelling cell on dispersal and gene flow, or the possibility of more than one spawning ground for this species promoting sub-structuring. A SAMOVA analyses run on the nDNA dataset maximised variance by grouping the Eastern Cape and southern KwaZulu-Natal together and Transkei and northern KwaZulu-Natal together in two groups. This revealed no evidence of spatial structure (p = 0.36), with only 3.30% of variation explained by this grouping. The removal of individuals below the estimated length at 50% maturity in the nDNA dataset, in order to test for temporal structure, resulted in stronger evidence of differentiation between the Eastern Cape and all other localities: Transkei (Fst = 0.081; p< 0.05), southern KwaZulu-Natal (Fst = 0.031; p<0.05), and northern KwaZulu-Natal (Fst = 0.078; p< 0.05). This indicates that some temporal genetic structure may exist between age classes within this species. The differentiation observed between the Eastern Cape and other localities, coupled with the high percentage of private haplotypes in the mtDNA dataset in this locality, indicates that this area is where P. praeorbitalis is most vulnerable to the potential negative effects of climate change on its genetic diversity. However, the vast majority of this species genetic diversity appears to reside towards the centre of its range where it is most abundant and the lack of strong genetic structure indicates high levels of gene flow. In conclusion, while P. praeorbitalis is vulnerable to range loss as a result of climate change, its genetic diversity is unlikely to be greatly affected.
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Teachers’ experiences of change : a case study analysis of a school-based intervention in rural Kwazulu-Natal
- Authors: James, Sally Jane
- Date: 2014
- Subjects: David Rattray Foundation , Educational change -- South Africa -- KwaZulu-Natal -- Case studies , Rural schools -- South Africa -- KwaZulu-Natal , Teachers -- Training of -- South Africa -- KwaZulu-Natal , Community and school -- South Africa -- KwaZulu-Natal , KwaZulu-Natal (South Africa) -- Social conditions , KwaZulu-Natal (South Africa) -- Economic conditions
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1980 , http://hdl.handle.net/10962/d1013118
- Description: The research presented in this thesis is a case study analysis of the school-based intervention initiated by the David Rattray Foundation [DRF]. David Rattray, a South African historian well known for his contribution to the 1879-1896 Anglo-Zulu War heritage, was murdered in January 2007. In response to his untimely death, the DRF was established by family and friends with the hope of improving education within the Umzinyathi rural municipal district of KwaZulu-Natal. This study consisted of three phases: Phase I (May-December 2011); Phase II (January-December 2012), and Phase III (December 2012-October 2013). During Phase I, the focus was on describing the broader context in which the case is located. It resulted in a narrative account of the emergence of the DRF as a non-governmental organisation [NGO] working towards change within the local rural school community. During Phase II the focus shifted from the broader socio-political and economic context to the human dimension which included teachers, principals, volunteer workers and a district official working in the schools. During Phase II the approach to change adopted by the DRF was critically analysed in relation to models of change described in the literature. Teachers’ experiences of change were also examined. Phase III was a synthesis of the findings from the first two research phases. By drawing on systems and complexity theory perspectives, insights were gained enabling a deep understanding of the DRF’s school-based intervention as a whole. This research is a qualitative study that seeks to understand individual teachers’ experiences and participation in a process of change that reaches beyond the individual and his/her immediate context. The adoption of a realist ontology (Maxwell, 2012) and application of an explanatory heuristic based on the critical realist philosophy of Bhaskar (1979, 1980, 2011) enabled the layered analysis and in-depth interpretation that characterises the study. The findings of the study reveal a complex and ongoing process of change within a rural school context. The results illuminate the efficacy of a collaborative partnership between civil society (the DRF), the local community, under the leadership of a tribal authority, and the local government (KwaZulu-Natal Provincial Department of Education). It also reveals how teachers within this particular context do not have a strong voice in the change process and hence participate only superficially in the school-based intervention. It is probable that the constraining mechanisms revealed through this research are not exclusive to this particular case study, but are common across the South African rural school context. The main contention of this thesis is that these mechanisms need further interrogation in order to enable further change and permit the active participation of teachers in the process.While the study illuminates many of the tensions and problems faced by the schools and the community in which they are located, it also highlights the achievements and selfless attitude of many people working towards change and improvement within the schools. This case study thus provides an example to all South Africans of what can be achieved with commitment and effort.
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Voluntary disclosure programmes and tax amnesties: an international appraisal
- Authors: Jaramba, Toddy
- Date: 2014
- Subjects: Tax amnesty -- South Africa , Tax evasion -- South Africa , Investments, Foreign -- Taxation -- South Africa , Tax collection -- South Africa , Tax administration and procedure -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:911 , http://hdl.handle.net/10962/d1015666
- Description: Tax amnesties are government programs that typically allow a short period of time for tax evaders to voluntarily repay previously evaded taxes without being subject to penalties and prosecution that discovery of such tax evasion normally brings. Tax amnesties differ widely in terms of coverage, tax types, and incentives offered. A state’s Voluntary Disclosure Programme is another avenue available to taxpayers to assist them in resolving their state tax delinquencies. This programme is an on-going programme as compared to a tax amnesty, which is there for a limited time period only. The main goal of the research was to describe the tax amnesty and the voluntary disclosure programmes in South Africa and to assess their advantages and disadvantages. This thesis also discussed another form of voluntary disclosure programme, referred to as an Offshore Voluntary Disclosure Programme, which allows taxpayers with unreported foreign bank accounts, and presumably unreported foreign income, to voluntarily disclose their affairs. The study found that, due to tax amnesties, Government raises more tax revenue not only in the short run from collecting overdue taxes but also by bringing former non-filers back into the tax system for the long run. It was also found that, initially short-run revenue brought in from overdue taxes will be positive for the first amnesty and then decline each time the amnesty is offered repeatedly. The reason for the decline in revenue might be that tax amnesties provide incentives for otherwise honest taxpayers to start evading taxes because they will anticipate the offering of future amnesties, thereby weakening tax compliance. The costs associated with amnesty programmes include negative long run revenue impact and also that amnesty programmes reduce compliance by taxpayers in the long-run. In South Africa tax amnesties, especially the voluntary disclosure programme, are likely to be successful since they will increase the revenue yield and also bring non-filers back on the tax rolls.
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Land redistribution and state decentralisation in South Africa
- Authors: Jaricha, Desmond Tichaona
- Date: 2014
- Subjects: Land reform -- South Africa , Land tenure -- South Africa , Agriculture -- Economic aspects -- South Africa , Decentralization in government -- South Africa , Local government -- South Africa , South Africa -- Politics and government
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3374 , http://hdl.handle.net/10962/d1013120
- Description: South Africa is a new democracy that has had to deal with many historical remnants of apartheid. One of the main remnants has been land dispossession and massive inequalities along racial lines of access to land for agricultural purposes. In countering this, the post-apartheid state has pursued land redistribution programmes since the end of apartheid in 1994, as part of a broader land reform project. Simultaneously, post-apartheid South Africa has been marked by significant state restructuring notably a process of state de-centralisation including the positioning of municipalities as development agents. Amongst other goals, this is designed to democratise the state given the authoritarian and exclusive character of the apartheid state, and thereby to democratise development initiatives and programmes. Land redistribution and state decentralisation in South Africa are different political processes with their own specific dynamics. They have though become interlinked and intertwined but not necessarily in a coherent and integrated manner. Within broader global developments pertaining to state decentralisation and land redistribution, the thesis examines the complex relations between these two processes in South Africa. In particular, I analyse critically the decentralised character of the land redistribution programme in South Africa. In order to concretise and illustrate key themes and points, I discuss a particular land redistribution project called Masizakhe located in Makana Municipality in the Eastern Cape Province.
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Geomorphic origin and dynamics of deep, peat-filled, valley bottom wetlands dominated by palmiet (Prionium serratum) : a case study based on the Goukou Wetland, Western Cape
- Authors: Job, Nancy Merle
- Date: 2014
- Subjects: Wetlands -- South Africa -- Western Cape , Peatlands -- South Africa -- Western Cape , Peatland conservation -- South Africa -- Western Cape , Peatland management -- South Africa , Aquatic plants -- South Africa -- Western Cape , Geomorphology -- South Africa -- Western Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4782 , http://hdl.handle.net/10962/d1013122
- Description: The Goukou Wetland is a 700 ha unchannelled valley bottom wetland near the town of Riversdale in the Western Cape of South Africa. The wetland is approximately 16 km long and between 200 and 800 m wide, with peat deposits up to 8 m deep that get progressively shallower downstream. The Goukou Wetland is one of the last remaining intact peatlands of significant size in the Western Cape. However, there is increasing human pressure on these peat wetlands, where the dominant plant is palmiet (Prionium serratum), which is endemic to the Western and Eastern Cape Provinces of South Africa. Palmiet is viewed as a problem plant by farmers as it is believed to block waterways and promote inundation of arable land and infrastructure. Many landowners therefore actively remove palmiet from peatlands, threatening the integrity of these wetlands. Although the hydrogeomorphic origin of large, non-peat floodplain and valley bottom wetlands has been investigated in South Africa, unchannelled valley-bottom wetlands with deep peat accumulations are rare features and have not been well studied. The hydrogeomorphic factors leading to peat accumulation have been documented elsewhere in Southern Africa, where aggradation due to sedimentation along trunk streams may block a tributary stream, elevating the local base level of the tributary, creating the accommodation space for organic sedimentation. Alternatively, sedimentation along a trunk stream at the toe of a tributary stream may similarly block a trunk stream, promoting organic sedimentation along the trunk stream upstream of the tributary. This pattern of peat accumulation is associated with declining peat thickness upstream of the blocked valley. In the case of the Goukou Wetland, however, peat depth and organic content was found to increase consistently upstream from the toe to the head of the wetland. The Goukou Wetland was graded along its length, with gradient increasing consistently upstream in response to longitudinal variation in discharge. There was no clear relationship between peat formation and tributary streams blocking the wetland. Instead, the distribution of peat and the extent of the wetland appeared to be controlled by the plant palmiet, whose clonal nature and robust root, rhizome and stem system allowed it to grow from channel banks and islands into fast-flowing river channels, slowing river flows and ultimately blocking the channel. The promotion of diffuse flows within the dense, monospecific stands of palmiet creates conditions conducive to water retention and peat accumulation. By growing across the full width of the valley floor, the plant is able to constrict the stream, trapping sediment and slowing flows such that the fluvial environment is changed from a fast flowing stream to one with slow, diffuse flow. These processes appear to lead to the formation of organic sediment, accumulating to form a deep peat basin. The sustained input of water from the folded and fractured quartzite lithologies of the Cape Supergroup that make up the Langeberg Mountains, which provide the bulk of the water supply to the wetland, is also important in promoting permanent flooding in the wetland. A feature that characterized the wetland was the fact that bedrock across the valley beneath the peat deposits exhibited a remarkably uniform elevation. This suggests that over long periods of time (tens to hundreds of thousands of years), bedrock has been laterally planed across the valley floor. It is proposed that valley widening associated with lateral planning of Uitenhage Formation rocks has taken place during periods of episodic very high flows. During these episodes, erosion cuts into the peat wetland and valley sides, cutting to bedrock and planing the valley floor to a uniform elevation for a given distance from the head of the wetland. Periods of episodic degradation are followed by periods of renewed peat accumulation associated with palmiet establishment, such that the wetland valley is shaped by repeated cycles of cutting and filling. Palmiet can be considered an “ecosystem engineer” that is integral to the formation of these deep peat basins. Removal of palmiet from these systems is likely to have negative consequences for the wetland and its functions in that water storage will be reduced, erosion will increase dramatically, and the water-purification function of the wetlands will be lost. Management of these wetlands, which are close to the geomorphic threshold slopes for their size, is therefore essential if they are to be preserved for the benefit of human well-being.
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An analysis of the impact of an official diagnosis and label of ʹdyslexiaʹ on pupils’ self-concept and self-esteem : a sociological case study involving pupils in Grahamstown
- Authors: Johnson, Gwendolyn Gay
- Date: 2014
- Subjects: Dyslexic children -- Education -- South Africa -- Grahamstown -- Case studies , Dyslexic children -- South Africa -- Grahamstown -- Psychological aspects -- Case studies , Dyslexic children -- Social aspects -- South Africa -- Grahamstown -- Case studies , Self-perception in adolescence , Emotions in adolescence , Dyslexia , Education, Secondary -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3375 , http://hdl.handle.net/10962/d1013124
- Description: The aim of this study is to develop an understanding of how Grahamstown teenagers are affected by the label ʹdyslexiaʹ; by providing a space in which their feelings about being labelled dyslexic and their experiences can be voiced. Historically much international and local research has focussed on causation and remediation of dyslexia and has neglected the social aspects of the diagnosis. Causation and remediation are categories which form part of the medical or educational models. A social model of dyslexia needs to be applied. Due to the paucity of South African literature on the social experiences of dyslexic teenagers, this research thesis aims to add to the body of knowledge and hopefully provide an avenue for more research within the context of Sociology. This is a micro study, situated in Grahamstown Eastern Cape, South Africa, and the author recognizes that responses cannot be generalized to the greater dyslexic population. All human environments consist of objects which are given meaning through social interaction. Meaning is central to human behaviour and therefor explains the ways in which humans conduct their lives based on these meanings. For this reason George Herbert Mead’s (1934) and Herbert Blumers (1969) symbolic interactionist positions have framed the theoretical approach to this research. Qualitative methods of interviewing provide an opportunity for dyslexic individuals to discuss the meaning dyslexia gives to them, from their perspective and in their own words. The following conclusions have been arrived at: Educational psychologists in Grahamstown are reticent to diagnose individuals as dyslexic. This lack of identification hinders early intervention which can be very detrimental to individuals struggling with reading, writing and spelling as well as the associated co-morbid conditions of dyslexia. Teenagers who have had early diagnosis and intervention with support structures in place identify with their dyslexic identity more positively as they are able to make sense of their struggles of a dyslexic nature.
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Control, compliance and conformity at the University of Fort Hare 1916 - 2000: a Gramscian approach
- Authors: Johnson, Pamela
- Date: 2014
- Subjects: University of Fort Hare -- History , University of Fort Hare -- Administration , Higher education and state -- South Africa , Hegemony -- South Africa , Conformity -- Political aspects -- South Africa , Abuse of administrative power -- South Africa , Education, Higher -- South Africa -- Eastern Cape , South Africa -- Politics and government -- 1916-2000 , Apartheid -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1325 , http://hdl.handle.net/10962/d1013126
- Description: Arising from Marxist theory, critical theory investigates the mechanisms that enable continued domination in capitalist society, with a view to revealing the real, but obscured, nature of social relations and enabling these to be challenged by subjugated classes. Within the broad spectrum of Marxist theory, social relations of domination and subordination are assigned according to the relationship of social classes to economic production. However, the neo-Marxist perspective developed by Antonio Gramsci locates relations of power within the broader context of the political economy. In doing so, the role of the State in a capitalist society assumes greater significance than that of maintaining and securing social relations on behalf of the dominant class through coercion and force. Instead, the State embarks on a range of activities in the attempted “exercise of hegemony”, or the cultivation of general acceptance by all social classes of existing social relations and conditions. Gramsci refers to this desired outcome as “consent”, the product of the successful exercise of hegemony, a political function which is thus crucial to the accumulation of capital. When unsuccessful, dissent cannot be contained by the State, and the extent to which contestation constitutes a threat is revealed by recourse to coercion. The manner in which relations of power are cemented through the exercise of hegemony lies at the core of this thesis. It investigates the relationship between the State and the administrators of an institution within civil society, the University of Fort Hare, as well as the responses to the activities of the State and University Administration within the University itself, over an extended period of time between 1916 and 2000. This period is divided into three specific time frames, according to changes in the expression of the South African State. In general, it is seen that conformity characterises the relationship between the State and the University Administration, underscoring the success of the State in fostering the role of education in the reproduction of social relations and values and in eliciting conformity. The nature of conformity is seen to vary according to different expressions of the State and changes in social relations, which are in turn informed by the overarching political economy and events taking place within society and the University of Fort Hare. Manifestations of consent and dissent, as responses to the attempted exercise of hegemony, are presented in the three periods corresponding to different expressions of the State. Four reasons for conformity, as presented by Gramscian scholar Joseph V Femia (1981), are utilised in order to explain and illustrate the nature of control and compliance at the University of Fort Hare between 1916 and 2000.
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An examination of validation practices in relation to the forensic acquisition of digital evidence in South Africa
- Authors: Jordaan, Jason
- Date: 2014
- Subjects: Electronic evidence , Evidence, Criminal , Forensic sciences , Evidence, Criminal -- South Africa -- Law and legislation
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4706 , http://hdl.handle.net/10962/d1016361
- Description: The acquisition of digital evidence is the most crucial part of the entire digital forensics process. During this process, digital evidence is acquired in a forensically sound manner to ensure the legal admissibility and reliability of that evidence in court. In the acquisition process various hardware or software tools are used to acquire the digital evidence. All of the digital forensic standards relating to the acquisition of digital evidence require that the hardware and software tools used in the acquisition process are validated as functioning correctly and reliably, as this lends credibility to the evidence in court. In fact the Electronic Communications and Transactions Act 25 of 2002 in South Africa specifically requires courts to consider issues such as reliability and the manner in which the integrity of digital evidence is ensured when assessing the evidential weight of digital evidence. Previous research into quality assurance in the practice of digital forensics in South Africa identified that in general, tool validation was not performed, and as such a hypothesis was proposed that digital forensic practitioners in South Africa make use of hardware and/or software tools for the forensic acquisition of digital evidence, whose validity and/or reliability cannot be objectively proven. As such the reliability of any digital evidence preserved using those tools is potentially unreliable. This hypothesis was tested in the research through the use of a survey of digital forensic practitioners in South Africa. The research established that the majority of digital forensic practitioners do not use tools in the forensic acquisition of digital evidence that can be proven to be validated and/or reliable. While just under a fifth of digital forensic practitioners can provide some proof of validation and/or reliability, the proof of validation does not meet formal international standards. In essence this means that digital evidence, which is preserved through the use of specific hardware and/or software tools for subsequent presentation and reliance upon as evidence in a court of law, is preserved by tools where the objective and scientific validity thereof has not been determined. Since South African courts must consider reliability in terms of Section 15(3) of the Electronic Communications and Transactions Act 25 of 2002 in assessing the weight of digital evidence, this is undermined through the current state of practice in South Africa by digital forensic practitioners.
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Teaching writing to Grade 5 English language learners in two Grahamstown East schools, South Africa : a case study
- Authors: Julius, Lukas Homateni
- Date: 2014
- Subjects: English language -- Study and teaching (Primary) -- South Africa -- Grahamstown English language -- Written English English language -- Composition and exercises -- Study and teaching (Primary) English language -- Ability testing Teacher effectiveness -- South Africa -- Grahamstown Teachers -- Rating of -- South Africa -- Grahamstown Written communication Second language acquisition
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1971 , http://hdl.handle.net/10962/d1011989
- Description: The majority of learners in South Africa are not native speakers of English, yet English is the dominant language of learning and teaching (LoLT). South African teachers, therefore, have the challenge of ensuring that their learners' literacy skills in English are adequately developed so as to facilitate learning in other curricular areas. This study investigated the way in which two Grade 5 teachers employed at different primary schools in the Eastern Cape province of South Africa taught writing to their English first additional language (EFAL) learners. English is the LoLT at both schools. A qualitative interpretive approach was used to identify factors that shape the ways these teachers handle the teaching of writing. The theoretical framework was informed by Borg's model of teacher cognition (2003) Shulman's conception of teacher knowledge (1987). Data collection methods consisted of interviews, classroom observations and document analysis. In-depth interviews, comprising two semi-structured interviews, two post-lesson informal conversational interviews and one stimulated recall interview were conducted with each teacher. Five of each teacher's writing lessons were observed and audio and video recorded. Samples of learners' written work were also collected. Analysis of the data reveals that the two teachers' beliefs, their experiences as learners themselves and subsequently as teachers, impacted on their pedagogy, as did other contextual factors (including the support they received from subject advisors, time management, and the number and range of learners in their classrooms). It was found that both teachers focused primarily on ensuring that their learners completed their written work so that it could be marked and graded in response to demands from their superiors, rather than on engaging deeply with the processes of writing (brainstorming, drafting, revising etc). Not only does this run counter to the writing pedagogy recommended in the Curriculum and Assessment Policy Statements (CAPS), but it also denies learners the scaffolding needed to help them develop the self-regulation skills needed to become independent writers. These findings demonstrate the need for assisting teachers to shift away from focusing only on learners' performance (testing and grading) towards a stronger emphasis on the process of writing. This would require that teachers develop a deeper understanding of the process/genre approaches to teaching writing advocated by CAPS.
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Exploration for sediment-hosted copper mineralization in Kaponda Prospect, Central African Copperbelt, Democratic Republic of Congo
- Authors: Kabunda, Ghislain Mwape
- Date: 2014
- Subjects: Copper mines and mining -- Central African Copperbelt (Congo and Zambia) , Sedimentation -- Central African Copperbelt (Congo and Zambia) , Prospecting -- Central African Copperbelt (Congo and Zambia) , Geological mapping -- Central African Copperbelt (Congo and Zambia) , Geochemistry -- Central African Copperbelt (Congo and Zambia) , Induced polarization
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5061 , http://hdl.handle.net/10962/d1013129
- Description: The Kaponda Prospect represents a surface of 915.8 km² located at about 10 km south of the town of Lubumbashi and 33km NW of Kasumbalesa in the Democratic Republic of Congo (DRC). It lies within Neoproterozoic sedimentary rocks of the Katangan Supergroup in the Central African Copperbelt (CACB). In this province, copper mineralization occurs at different stratigraphic level with different associated alteration. Mineralization is of multistage origin from synsedimentary, diagenetic to post orogenic. Since the discovery of the CACB in the early 20th century, several exploration techniques have been used to delineate Cu deposits. A review and application of these methods including remote sensing, geological mapping, geochemical and geophysical surveys, and drilling, gives an insight of their effectiveness and limitation before analyzing their results from the Kaponda Prospect. The geology and structure of the Prospect is represented by a series of two NW trending disharmonic tight anticlines, locally domal, with cores occupied by either Roan Group or “Grand Conglomerat” Formation. These anticlines are separated by an open syncline made of Kundelungu rocks. Two mains direction of faults are recognized, the NW and NE trending structures. The latter direction are normal transfer faults which can serve as conduit for mineralization. They are related to the late orogenic extension of the Lufilian belt. However NE trending faults are believed to be associated to the climax of Lufilian folding or represents synsedimentary intergrowth faults. Exploration approach for sediment-hosted Cu within Kaponda Prospect, take into account the integration of all information derived from different techniques. Remote sensing is used as aid to geology. Landsat and Google earth images show lineaments that corresponds to lithostratigraphy boundary and domal anticline. Geological mapping identified reduced horizons which can potentially host mineralization, whereas analysis of structure measurements reveals the geometry of fold and direction of its axial plane and hinge. Statistical methods such as the main + 2 standard deviation, the frequency histogram and probability plot, together with experiential method are used to constrain and define Cu and Co thresholds values in soil samples. It appears that in this region, log-probability plot and histogram methods combined with spatial representation and the experience of the region, are the best practice to constrain and separate geochemical background from anomaly data. Ground and airborne magnetic, and radiometric images show specific signatures which map alteration and particularly lithostratigraphy such as “Roan” Group, “Grand Conglomerat” unit, “Nguba” cap carbonates and “Kundelungu” siliciclastic units. Analysis of faults interpreted from geophysical maps identified three major directions: E-W, NE-SW and NW-SE. The E-W faults are also interpreted as normal transfer faults such NE-SW structures, consistent with regional geological map. Although pole-dipole array of induced polarization (IP) survey was directly targeting disseminated Cu sulphide, its results suffer in responding to graphitic rocks and barren pyrite. Only relative small chargeable bodies need to be tested in drilling follow-up. A total of 15 targets have been generated through re-interpretation and integration of both geological mapping and remote sensing, geochemical and geophysical data, as well as existing drilling. Specific recommendations of follow-up works are advised for each type of target.
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The involvement of TRAP1 in the mitochondrial localization of STAT3 in mammalian cells
- Authors: Kadye, Rose
- Date: 2014
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/55760 , vital:26731
- Description: STAT3 (signal transducer and activator of transcription 3), an oncogene and transcription factor of genes involved in cellular differentiation, proliferation and immune function, that classically localizes in the cytosol and nucleus has also been found in the mitochondria. However, STAT3 does not have a mitochondrial transit peptide, and its mechanism for mitochondrial localization is unknown. Cytosolic Hsp90s chaperone STAT3 to the nucleus therefore we investigated the involvement of the nuclear-encoded mitochondrial Hsp90 molecular chaperone tumor necrosis receptor associated protein 1 (TRAP1) in STAT3’s mitochondrial localization. Using TRAP1 transient over-expression, STAT3 inhibitor S3I- 201 and Hsp90 inhibitor geldanamycin, we demonstrate that TRAP1 and STAT3 co-localize and co-immunoprecipitates in mammalian systems. Taken together with the observation that STAT3 potentially directly interacts with TRAP1, these data suggest that TRAP1 plays a role in the mitochondrial localization of STAT3.
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Understanding educators' and learners' perceptions and experiences of their participation in Science Fairs/Expos : a South African case study.
- Authors: Kahenge, Wendelina Nambahu
- Date: 2014
- Subjects: Science fairs -- South Africa -- Grahamstown , Science -- Study and teaching -- South Africa -- Grahamstown , Vocational guidance -- South Africa -- Grahamstown , School children -- South Africa -- Attitudes , Teachers -- South Africa -- Attitudes , Teacher effectiveness -- South Africa -- Grahamstown
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1981 , http://hdl.handle.net/10962/d1013130
- Description: The rationale behind Science Expos is to develop and empower learners to be able to identify problems and find solutions (Eskom Expo Project Guide Book, 2013). It is believed that involvement in Science Expos arouses learners' interest to pursue science related careers. But despite these ideals, there is still poor participation in Science Expos by educators and learners. I conducted this case study in five schools in Grahamstown, Eastern Cape, South Africa. The purpose of this study was to understand educators' and learners' perceptions and experiences of their participation in Science Expos. The case study was designed within an interpretive paradigm. The data were generated, triangulated and validated by a variety of methods, namely, document analysis, interviews (semi-structured and focus group) and observations. The main findings of the study were that learners who participate in Science Expos attend workshops organised by Scifest and SAEON office with the help of some of the educators and lecturers from Rhodes University. Learners' participation was influenced and assisted by the educators and peers with whom they were able to communicate and share their projects with. It emerged from the study that, as a result of participating in Science Expos, educators (teachers) and learners were exposed to a wide variety of scientific investigations and skills that are necessary for their classroom based-scientific investigations. It also emerged from this study that educators and learners face the challenge of a lack of motivation; insufficient support from schools and parents; time constraints to support learners in their participation and a lack of knowledge among some educators on their learners' projects. Some learners are even discouraged from participating in Science Expos by their peers on the grounds that they have no chance of winning. Teachers therefore require continuous mentorship and capacity building in order to encourage their learners to partake.
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Invasive alien species as drivers in socio-ecological systems: Local adaptations towards use of Lantana in Southern India
- Authors: Kannan, Ramesh , Shackleton, Charlie M , Shaanker, Ramanan U
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/180932 , vital:43671 , xlink:href="https://doi.org/10.1007/s10668-013-9500-y"
- Description: Lantana camara. L (hereafter Lantana) was first introduced by the British into India in 1807 as an ornamental plant. Since then the species has spread across the length and breadth of the country. Attempts to control Lantana in India have not been successful. In this study, we analysed the use of Lantana by local communities in southern India and identified the possible causes and consequences of its use through the use of a household survey of the socio-economic profile of the user and nonuser households and an analysis of the ecological history of the communities. Communities have been using Lantana for over 25–30 years and apparently such use was not prompted by external agencies. The characteristics of user and nonuser households were similar, except that Lantana users were more literate and had a greater number of occupations per household than nonusers. Per capita income was similar between user and nonuser groups. For nonuser groups, their main income sources were from trading (44 %), wage labour (32 %) and forest resources (23 %). In contrast, the Lantana user groups substituted their loss of income from forest resources (7 %) by income from Lantana (46 %). The ecological history revealed that Lantana was adopted as a resource at a time when it was increasing in the landscape and traditional bamboo resources were in decline because of overuse by commercial enterprises and mast flowering. This change in ecological resource availability prompted a major shift in livelihoods for some in the area.
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Collection of urban tree products by households in poorer residential areas of three South African towns
- Authors: Kaoma, Humphrey , Shackleton, Charlie M
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/180980 , vital:43678 , xlink:href="https://doi.org/10.1016/j.ufug.2014.02.002"
- Description: The high rates of urban in-migration and poverty common in many developing country towns potentially increases the reliance of urban populations on the direct benefits provided by trees. Yet understanding of the extent of such use and the sources of these tree products is limited. Here we report on the extent of use of urban tree products by 450 households in the poorer areas of three towns along a rainfall gradient based on household questionnaires. We considered the proportion of households making use of each of several tree products and the collection or purchasing frequency which we disaggregated by source of the product, including trees in homesteads, urban spaces, edges of towns and via purchase from traders. Most households (91%) used firewood, which was most frequently collected from the urban fringe or purchased, although one-third at times also collected firewood from trees on their home plot. All households used fruits, most commonly sourced through purchase (98%), but nearly half of whom also supplemented by harvesting fruits from their home plot. Other products used included wood for building, fencing and utensils, herbal medicines, planting material and mulch. Collection of products from urban homestead trees was highest amongst households in the informal settlements and least in the more established townships. Residents of new low-cost housing areas made extensive use of urban tree products harvested in urban spaces because they had fewer homestead trees than residents of informal areas or townships. Overall, urban residents made use of a wide array of tangible products from trees which they sourced from a variety of places, including their homestead plot. This urges that planning agencies ensure that homestead plot sizes or other urban spaces that provide tree products are large enough to support the direct needs of poorer urban residents.
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Homestead greening is widespread amongst the urban poor in three medium-sized South African towns
- Authors: Kaoma, Humphrey , Shackleton, Charlie M
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/398291 , vital:69398 , xlink:href="https://doi.org/10.1007/s11252-014-0362-3"
- Description: Trees in urban areas are important sources of ecosystem services and benefits. In most towns the bulk of urban biodiversity, and trees specifically, are found in homestead gardens. But there is only limited understanding of the tree holdings in such gardens, and how they vary within and between towns, especially for developing countries where rapid urbanisation and high poverty influence the use of and reliance on land and local resources. We report on the nature of tree holdings in private gardens of poorer suburbs in three medium-sized towns along a gradient of decreasing mean annual rainfall in northern South Africa. A total of 3 217 trees were enumerated across 450 randomly selected homesteads. Most (90 %) households had at least one tree on their homestead, with an average of 7.7 ± 6.1 trees. Most householders had planted the trees themselves. The density of trees declined along the moisture gradient. Within towns, tree density was positively related to garden size, which in turn was related to relative affluence and age of the suburb. Newer and poorer suburbs had the fewest trees per household. Sixty-two tree species were recorded, which were dominated by alien species, especially fruit trees. There was no relationship between the moisture gradient and tree species richness per household, but within towns there was a difference between suburbs, being lowest in the newest suburbs. Numbers of trees and species per household was positively related to age of the household head.
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Refugium : an exploration through landscapes of liminality
- Authors: Kaplan, Luke
- Date: 2014
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:20985 , http://hdl.handle.net/10962/5890
- Description: Loosely following a narrative form and structure, this thesis begins, in chapter one, by considering people who occupy a peripheral position in - or on the fringe of - society. In so doing, it analyses the dichotomy created between centre and periphery, the line between qualities or features that are set up as different or opposed. The chapter begins by contextualising my own engagement with the themes and narratives dealt with. It then looks at the representation and significance of historical and cultural characters such as the tramp and the wanderer, the medieval wildman and the outcast, the madman and the prophet, and relates this to some extent to my own narrative. The dichotomy between culture and nature is thus examined here. The paper then moves on, in chapter two, to examine concerns around landscape, and considers how we engage or separate ourselves from it. The theme of walking is examined closely from an experiential, phenomenological standpoint, especially as an activity which allows greater connection to, and engagement with, the landscape. The relationship between landscape, place, and identity is also explored, looking at how identity is interwoven with connection to place, and, broadly, what this might mean for displaced people. These discussions and ideas are then brought to bear again on my personal narrative. In chapter three I explore again the separation between dichotomous concepts as looked at in chapter one; I examine the separations between, and within, people, as well as between people and their environment. Here, however, the line of separation is explored not as an impermeable barrier, but as a liminal space of potential and possibility. With this in mind I look at sacred or liminal places within the landscape, as well as the idea of the sublime. I also consider the camera from this perspective, and finally present my own exhibition and body of work, reviewing it in the light of the narratives and themes explored through the thesis.
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The intellectualisation of African languages, multilingualism and education: a research-based approach
- Authors: Kaschula, Russell H , Maseko, Pamela
- Date: 2014
- Subjects: African languages -- Study and teaching (Higher) -- South Africa , Language policy -- South Africa , Education, Higher -- South Africa , Educational change -- South Africa , Multiligualism , Multicultural education -- South Africa , Language and languages -- Study and teaching
- Language: English
- Type: article , text
- Identifier: http://hdl.handle.net/10962/59321 , vital:27548 , http://alternation.ukzn.ac.za/Files/docs/21 SpEd13/Alternation Spec Ed 13 (2014).pdf#page=13
- Description: This paper seeks to understand the relationship between the intellectualisation of African languages and the facilitation of a research approach which will enhance this intellectualisation. The paper examines the legislative language policies and other documents published by government since 1994, which guide language use and practices in higher education, including the Catalytic Project on Concept Formation in indigenous African languages (one of the recommendations contained in the Report commissioned by the Minister of Higher Education for the Charter for Humanities and Social Sciences and the language clauses of the Green Paper for Post-Secondary School Education and Training). These policy documents are analysed against the backdrop of the research work of the newly initiated NRF SARChI Chair in the Intellectualisation of African Languages, Multilingualism and Education hosted by Rhodes University. The paper argues that while policy provides an enabling environment for the promotion and development of indigenous African languages and advocates for promotion of equity and equality, in actual fact, HEIs still grapple in implementing provisions of these policies. The paper further discusses the teaching, learning and research in the African Language Studies Section of the School of Languages at Rhodes University and how the Section adopted the provisions of the national policy and institutional policy on language in turning itself into a source of intellectual vitality in the teaching, learning and research of particularly isiXhosa. Six focus areas of research, linked to the NRF SARChI Chair, will be outlined in order to create a practical link between Policy, Implementation and the Intellectualisation of African Languages. , Ucwaningo lolu luhlose ukuqonda ubudlelwano obuphakathi kokusetshenziswa kwezilimi zesintu emazingeni aphakame kanye nokusetshenziswa kwendlela yocwaningo ezokwengeza amathuba okusetshenziswa kwezilimi lezi (Finlayson & Madiba 2002). Ucwaningo luhlaziya inqubomgomo yolimi esemthethweni neminye imibhalo eshicelelwe uhulumeni elawula ukusebenza nokusetshenziswa kwezilimi kwezemfundo ephakame kusuka ngonyaka wezi-1994, kanye ne-Catalytic Project on Concept Formation in indigenous African languages (esinye seziphakamiso esiqukethwe embikweni owethulwa ngungqonqoshe wezemfundo ephakeme nge-Charter of Humanities and Social Sciences (HSSC 2011) kanye nezinhlamvu zamazwi e-Green paper for Post-secondary School education and training (2012). Imibhalo yenqubomgomo ihlaziywa kubhekwe umsebenzi wocwaningo kasihlalo we- NRF SARChl ekusetshenzisweni kwezilimi zesintu emazingeni aphakeme nobuliminingi kanye nezemfundo e- Rhodes University. Ucwaningo lolu luphakamisa umbono othi noma inqubomgomo isipha amandla okukhuphula nokuthuthukisa izilimi zesintu kanye nokukhuthaza ukulingana nokungacwasi, eqinisweni izikhungo zemfundo ephakeme zihlangabezana nobunzima bokusebenzisa izihlinzeko zenqubomgomo. Ucwaningo lolu luzoxoxa futhi ngokufundisa nokufunda kanye nocwaningo emnyangweni wezifundo zezilimi zesintu esikoleni sezilimi e-Rhodes University kanye nokuthi umnyango lo wamukela njani izihlinzeko zenqubomgomo kazwelonke kanye nezesikhungo eziphathelane nokuguqulwa kwezilimi zibe umthombo wenhlakanipho ekufundiseni nasekufundeni kanye nocwaningo ngolimi lwesiXhosa. Imikhaka emqoka eyisithupha yocwaningo ehlobene nesihlalo se-NRF SARChl izovezwa ukuze kwakhiwe ubudlelwano obenzekayo phakathi kwenqubomgomo, ukusetshenziswa kwayo kanye nokusetshenziswa kwezilimi zesintu emazingeni aphakeme.
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Development and evaluation of pictograms on medication labels for patients with limited literacy skills in a culturally diverse multiethnic population:
- Authors: Kheir, Nadir , Awaisu, Ahmed , Radoui, Amina , El Badawi, Aya , Jean, Linda , Dowse, Roslind
- Date: 2014
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/156720 , vital:40041 , https://doi.org/10.1016/j.sapharm.2013.11.003
- Description: Much of the migrant workforce in Qatar is of low literacy level and does not understand Arabic or English, presenting a significant challenge to health care professionals. Medicine labels are typically in Arabic and English and are therefore poorly understood by these migrant workers. To develop pictograms illustrating selected medicine label instructions and to evaluate comprehension of the pictograms or conventional text supported with verbal instructions in foreign workers with low literacy skills.
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Changes and continuities in the labour process on commercial farms in post-Apartheid South Africa : studies from Eastern Cape and KwaZulu-Natal Provinces
- Authors: Kheswa, Nomzamo Sybil
- Date: 2014
- Subjects: Agricultural laborers -- South Africa -- Eastern Cape , Agricultural laborers -- South Africa -- KwaZulu-Natal , Agricultural wages -- South Africa -- Eastern Cape , Agricultural wages -- South Africa -- KwaZulu-Natal , Eastern Cape (South Africa) -- Rural conditions , KwaZulu-Natal (South Africa) -- Rural conditions , Agricultural laborers -- South Africa -- Eastern Cape -- Social conditions , Agricultural laborers -- South Africa -- KwaZulu-Natal -- Social conditions , Agricultural laborers -- Legal status, laws, etc. -- South Africa -- Eastern Cape , Agricultural laborers -- Legal status, laws, etc. -- South Africa -- KwaZulu-Natal , Apartheid -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3366 , http://hdl.handle.net/10962/d1011978 , Agricultural laborers -- South Africa -- Eastern Cape , Agricultural laborers -- South Africa -- KwaZulu-Natal , Agricultural wages -- South Africa -- Eastern Cape , Agricultural wages -- South Africa -- KwaZulu-Natal , Eastern Cape (South Africa) -- Rural conditions , KwaZulu-Natal (South Africa) -- Rural conditions , Agricultural laborers -- South Africa -- Eastern Cape -- Social conditions , Agricultural laborers -- South Africa -- KwaZulu-Natal -- Social conditions , Agricultural laborers -- Legal status, laws, etc. -- South Africa -- Eastern Cape , Agricultural laborers -- Legal status, laws, etc. -- South Africa -- KwaZulu-Natal , Apartheid -- South Africa
- Description: This thesis examines the agricultural labour process on commercial farms in post-apartheid South Africa with a particular focus on systems of labour control on these farms. Considerable literature exists about the labour process in capitalist society but the capitalist labour process does not exist in any pure form. Rather, different labour processes exist and the specific form they take depends on spatial and temporal conditions. Additionally, labour processes are often economic sector-specific. Because of variation in capitalist labour processes, differences in systems of labour control (or labour control regimes) also arise. Historically, up until the end of apartheid in 1994, the labour control regime on commercial farms in South Africa was marked by a paternalistic despotism of a racialised kind. This in part reflected the fact that commercial farms were simultaneously sites of both economic production and social reproduction and, further, they were very privatised agrarian spaces largely unregulated (specifically with regard to labour) by the state. Since the end of apartheid, commercial farms have been subjected to multiple pressures. Notably, the South African state has strongly intervened in labour relations on commercial farms, and commercial farms have been subjected to ongoing neo-liberal restructuring. This has led to the prospects of changes in the prevailing labour control system on commercial farms. In this context, the thesis pursues the following key objective: to understand changes and continuities in the labour process on commercial farms – and particularly labour control systems – subsequent to the end of apartheid in South Africa. It does so with reference to four farms in Eastern Cape and KwaZulu-Natal Provinces.
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Photophysichochemical behavior of carbazole derivatized zinc phthalocyanine in the presence of ZnO microparticles and when embedded in electrospun fibers
- Authors: Khoza, Phindile , Antunes, Edith M , Nyokong, Tebello
- Date: 2014
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/193860 , vital:45400 , xlink:href="https://doi.org/10.1016/j.dyepig.2013.12.019"
- Description: The synthesis of a zinc phthalocyanine complex tetrasubstituted with carbazole functionality at the peripheral position (complex 4) is reported. The singlet oxygen quantum yield of the complex was found to be 0.83 in dimethylformamide (DMF). The complex was subsequently conjugated to zinc oxide microparticles (ZnOMPs), the conjugation (formation of the amide bond) was confirmed by IR spectroscopy. The presence of ZnOMPs was found to reduce the singlet oxygen produced (ΦΔ = 0.63) in DMF. Polystyrene electrospun fibers of complex 4 alone and its conjugate to ZnOMPs were found to be thermally stable. The singlet oxygen quantum yield of the modified electrospun fibers was determined in aqueous media with ADMA as a singlet oxygen quencher and were 0.25 and 0.20 for complex 4 and 4-ZnOMPs embedded in fibers, respectively.
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